Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Operating activities
Net income	$ 153,054,000		$ 78,980,000
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization	447,766,000		387,599,000
Other amortization expenses	3,065,000		6,543,000
Stock-based compensation expense	21,837,000		12,694,000
Loss (gain) on derivatives, net	351,000		(407,000)
Loss (gain) on extinguishment of debt, net	(383,000)		308,000
Income (loss) from unconsolidated entities	17,073,000		3,198,000
Rental income in excess of cash received	(26,414,000)		(18,463,000)
Amortization related to above (below) market leases, net	365,000		245,000
Net loss (gain) on sales of properties	(13,079,000)		(52,495,000)
Distributions by unconsolidated entities	7,155,000		0
Increase (decrease) in accrued expenses and other liabilities	5,433,000		25,507,000
Decrease (increase) in receivables and other assets	(21,455,000)		(36,356,000)
Net cash provided from (used in) operating activities	595,534,000		406,737,000
Investing activities
Cash disbursed for acquisitions	(488,066,000)		(2,432,376,000)
Cash disbursed for capital improvements to existing properties	(54,688,000)		(48,480,000)
Cash disbursed for construction in progress	(95,201,000)		(119,333,000)
Capitalized interest	(3,305,000)		(2,992,000)
Investment in real estate loans receivable	(54,877,000)		(53,072,000)
Other investments, net of payments	(47,858,000)		8,051,000
Principal collected on real estate loans receivable	20,941,000		55,547,000
Contributions to unconsolidated entities	(246,794,000)		(361,107,000)
Distributions by unconsolidated entities	22,925,000		14,786,000
Proceeds from (payments on) derivatives investing	0		(2,604,000)
Decrease (increase) in restricted cash	7,682,000		(82,292,000)
Proceeds from sales of real property	140,819,000		321,303,000
Net cash provided from (used in) investing activities	(798,422,000)		(2,702,569,000)
Financing activities
Net increase (decrease) under unsecured lines of credit arrangements	(130,000,000)		0
Proceeds from issuance of senior unsecured notes	0		497,862,000
Payments to extinguish senior unsecured notes	(1,000)		(3,000)
Secured debt issued	10,690,000		71,340,000
Payments on secured debt	(219,980,000)		(73,557,000)
Net proceeds from the issuance of common stock	1,101,969,000		1,730,235,000
Decrease (increase) in deferred loan expenses	(3,395,000)		(10,790,000)
Contributions by noncontrolling interests	4,485,000	[1]	3,730,000	[1]
Distributions to noncontrolling interests	(14,208,000)	[1]	(9,860,000)	[1]
Acquisitions of noncontrolling interests	(1,175,000)		0
Cash distributions to stockholders	(495,256,000)		(433,018,000)
Other financing activities	(608,000)		(2,072,000)
Net cash provided from (used in) financing activities	252,521,000		1,773,867,000
Effect of foreign currency translation on cash and cash equivalents	(1,059,000)		673,000
Increase (decrease) in cash and cash equivalents	48,574,000		(521,292,000)
Cash and cash equivalents at beginning of period	158,780,000		1,033,764,000
Cash and cash equivalents at end of period	207,354,000		512,472,000
Supplemental cash flow information:
Interest paid	224,544,000		196,980,000
Income taxes paid	$ 11,955,000		$ 2,625,000

[1] (1) Includes amounts attributable to redeemable noncontrolling interests.